/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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****************************************************************************/

#pragma once

#include <QObject>
#include <QTextEdit>

namespace FakeVim {
namespace Internal {

enum RangeMode
{
    // Reordering first three enum items here will break
    // compatibility with clipboard format stored by Vim.
    RangeCharMode,         // v
    RangeLineMode,         // V
    RangeBlockMode,        // Ctrl-v
    RangeLineModeExclusive,
    RangeBlockAndTailMode // Ctrl-v for D and X
};

struct Range
{
    Range() {}
    Range(int b, int e, RangeMode m = RangeCharMode);
    QString toString() const;
    bool isValid() const;

    int beginPos = -1;
    int endPos = -1;
    RangeMode rangemode = RangeCharMode;
};

struct ExCommand
{
    ExCommand() {}
    ExCommand(const QString &cmd, const QString &args = QString(),
        const Range &range = Range());

    bool matches(const QString &min, const QString &full) const;

    QString cmd;
    bool hasBang = false;
    QString args;
    Range range;
    int count = 1;
};

// message levels sorted by severity
enum MessageLevel
{
    MessageMode,    // show current mode (format "-- %1 --")
    MessageCommand, // show last Ex command or search
    MessageInfo,    // result of a command
    MessageWarning, // warning
    MessageError,   // error
    MessageShowCmd  // partial command
};

class FakeVimHandler : public QObject
{
    Q_OBJECT

public:
    explicit FakeVimHandler(QWidget *widget, QObject *parent = 0);
    ~FakeVimHandler();

    QWidget *widget();

    // call before widget is deleted
    void disconnectFromEditor();

    static void updateGlobalMarksFilenames(const QString &oldFileName, const QString &newFileName);

public:
    void setCurrentFileName(const QString &fileName);
    QString currentFileName() const;

    void showMessage(MessageLevel level, const QString &msg);

    // This executes an "ex" style command taking context
    // information from the current widget.
    void handleCommand(const QString &cmd);
    void handleReplay(const QString &keys);
    void handleInput(const QString &keys);
    void enterCommandMode();

    void installEventFilter();

    // Convenience
    void setupWidget();
    void restoreWidget(int tabSize);

    // Test only
    int physicalIndentation(const QString &line) const;
    int logicalIndentation(const QString &line) const;
    QString tabExpand(int n) const;

    void miniBufferTextEdited(const QString &text, int cursorPos, int anchorPos);

    // Set text cursor position. Keeps anchor if in visual mode.
    void setTextCursorPosition(int position);

    QTextCursor textCursor() const;
    void setTextCursor(const QTextCursor &cursor);

    bool jumpToLocalMark(QChar mark, bool backTickMode);

    bool eventFilter(QObject *ob, QEvent *ev);

signals:
    void commandBufferChanged(FakeVimHandler *self, const QString &msg, int cursorPos, int anchorPos,
                              int messageLevel);
    void statusDataChanged(FakeVimHandler *self, const QString &msg);
    void extraInformationChanged(FakeVimHandler *self, const QString &msg);
    void selectionChanged(FakeVimHandler *self, const QList<QTextEdit::ExtraSelection> &selection);
    void highlightMatches(FakeVimHandler *self, const QString &needle);
    void writeAllRequested(FakeVimHandler *self, QString *error);
    void moveToMatchingParenthesis(FakeVimHandler *self, bool *moved, bool *forward, QTextCursor *cursor);
    void checkForElectricCharacter(FakeVimHandler *self, bool *result, QChar c);
    void indentRegion(FakeVimHandler *self, int beginLine, int endLine, QChar typedChar);
    void completionRequested(FakeVimHandler *self);
    void simpleCompletionRequested(FakeVimHandler *self, const QString &needle, bool forward);
    void windowCommandRequested(FakeVimHandler *self, const QString &key, int count);
    void findRequested(FakeVimHandler *self, bool reverse);
    void findNextRequested(FakeVimHandler *self, bool reverse);
    void handleExCommandRequested(FakeVimHandler *self, bool *handled, const ExCommand &cmd);
    void requestDisableBlockSelection(FakeVimHandler *self);
    void requestSetBlockSelection(FakeVimHandler *self, const QTextCursor &cursor);
    void requestBlockSelection(FakeVimHandler *self, QTextCursor *cursor);
    void requestHasBlockSelection(FakeVimHandler *self, bool *on);
    void foldToggle(FakeVimHandler *self, int depth);
    void foldAll(FakeVimHandler *self, bool fold);
    void fold(FakeVimHandler *self, int depth, bool fold);
    void foldGoTo(FakeVimHandler *self, int count, bool current);
    void jumpToGlobalMark(FakeVimHandler *handler, QChar mark, bool backTickMode, const QString &fileName);

public:
    class Private;

private:
    Private *d;
};

} // namespace Internal
} // namespace FakeVim

Q_DECLARE_METATYPE(FakeVim::Internal::ExCommand)
